Ralph Strebel

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Ralph Strebel (* 1944 ) is a Swiss mathematician.

Strebel received his doctorate in 1973 under Urs Stammbach at the ETH Zurich ("The series of derivatives of E groups"). He was a full professor at the University of Friborg until his retirement in 2007 .

Strebel deals with combinatorial and geometric group theory . With Robert Bieri and Walter David Neumann , he introduced a new geometric invariant into group theory ( Bieri-Neumann-Strebel invariant ).

Individual evidence

  1. ↑ Worldcat
  2. ^ Ralph Strebel in the Mathematics Genealogy Project (English) Template: MathGenealogyProject / Maintenance / id used.
  3. ↑ Entry in Kürschner's Scholars Calendar 2009.
  4. ^ Robert Bieri , Ralph Strebel: Valuations and finitely presented metabelian groups. In: Proceedings of the London Mathematical Society . Volume 41, 1980, pp. 439-464.
  5. ^ Robert Bieri, Walter David Neumann , Ralph Strebel: A geometric invariant of discrete groups. In: Inventiones Mathematicae . Volume 90, 1987, pp. 451-477.
personal data
SURNAME Strebel, Ralph
BRIEF DESCRIPTION Swiss mathematician
DATE OF BIRTH 1944